Finding the Fourth Proportional to 42,978.15, 64,468.13 and 13,396.24

Step by Step Solution

1. Step 1: Write the proportion equation
   42,978.15 : 64,468.13 = 13,396.24 : x
2. Step 2: Convert to fraction form
   42,978.15/64,468.13 = 13,396.24/x
3. Step 3: Cross multiply
   42,978.15x = 64,468.13 × 13,396.24
4. Step 4: Simplify right side
   42,978.15x = 863,630,541.83
5. Step 5: Solve for x
   x = 863,630,541.83/42,978.15
6. Step 6: Final answer
   x = 20,094.64